{"product_id":"wet-and-dry-bulb-thermometer-masons-hygrometer-wall-mountable-relative-humidity-temperature-gauge-with-water-reservoir","title":"Wet and Dry Bulb Thermometer (Mason's Hygrometer) – Wall-Mountable Relative Humidity \u0026 Temperature Gauge with Water Reservoir","description":"Accurately measure ambient room temperature and relative humidity with this classic Wet and Dry Bulb Thermometer. Featuring a dual-tube design and built-in water reservoir, this Mason-style hygrometer provides reliable environmental tracking for greenhouses, laboratories, weather stations, and industrial spaces.\n\nThe instrument utilizes two parallel liquid-in-glass thermometers—one dry bulb to record ambient air temperature, and one wet bulb wrapped in a cotton wick fed by an integrated water reservoir. As water evaporates from the wick, it cools the wet bulb; comparing the temperature difference between both tubes using standard psychrometric tables yields accurate relative humidity readings.\n\nBoth tubes feature dual-scale displays calibrated in Celsius (−10°C to 50°C) and Fahrenheit (20°F to 120°F). The high-visibility yellow plastic frame is weather-resistant and includes top and bottom mounting holes for easy wall installation.\n\nKey Features:\n- Simultaneous measurement of ambient air temperature and relative humidity percentage\n- Clear red spirit liquid tubes with easy-to-read markings in both Celsius and Fahrenheit\n- Heavy-duty base reservoir keeps the wet bulb wick continuously moist\n- Durable, molded plastic housing protects thermometer bulbs\n- No batteries required—traditional thermodynamic design for continuous operation\n- Ideal for greenhouses, agriculture, meteorology, laboratory research, textile mills, and storage facilities\n\nUse distilled or deionized water in the reservoir for optimal performance. Replace the cotton wick when it becomes dirty or discolored to ensure proper evaporation efficiency.","brand":"edumartstore","offers":[{"title":"Default Title","offer_id":47214093992124,"sku":"2","price":225.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0740\/8566\/2908\/files\/LAB.MEA.96938760_1668352296415.webp?v=1785412427","url":"https:\/\/www.edumartplus.com\/products\/wet-and-dry-bulb-thermometer-masons-hygrometer-wall-mountable-relative-humidity-temperature-gauge-with-water-reservoir","provider":"edumartstore","version":"1.0","type":"link"}